Daniel drawbaugh



(No Model.)

. D. DRAWBAUGH.

TELEPHONE ELECTRODE.

N0 540,961., Patent'edJune 11,1895.

W itnesses: Inventor:

attorney.

m: humus PEYER$ 0o. PHOTQUTHQ" WASHINGTON, n c.

UNITED STATES ATENT FFICE.

DANIEL DRAVVBAUGH, OF EBERLYS MILL, ASSIGNOR TO G. MILTON BAIR, OFHANOVER, AND CALVIN W. BEAM, OF READING, PENNSYLVANIA.

TELEPHONE-ELECTRODE.

SPECIFICATION forming m of Letters Patent No. 540,961, dated June 1 1,1895.-

- Application filed February 21, 1895. Serial No. 539,273. (No model.)

To a whom it m y OO II: provided each with a fixed carbon point, the Beit known that I, DANIEL DRAWBAUGH, two points being arranged injuxtaposition to a citizen of the United States, residing at and inalignment with each other, an annulus Eberlys Mill, in the countyofOumberland arranged between the diaphragms and sur- 55 5 and State ofPennsylvania, have invent-ed'cerrounding the said points, an interposedbody tain new and useful Improvements in Teleof carbon between thepoints, and a binder phone-Electrodes; and I do hereby declareforholding the parts properly assembled;furthe following to be a full,clear, and exact thermore,inatelephone-electrode comprising descriptionof the invention, such as will entwo diaphragms provided each with afixed 6o 10 able others skilled in the art to which it apcarbon point,the two points being arranged pertains to make and use the same. injuxtaposition to and in alignmentwith each Th s. invention relates totelephone elecother, an elastic or spongiform annulus ar- .trodes.ranged between the diaphragms and sur- The object is to present anelectrode comrounding the said points, an interposed body 15 bining thefunctions of a holder for loose or of granular carbon between thepoints, and a granular carbon, and a diaphragm ordiaperipherally-arranged binder for holding the phragms, the electrodeas presented constiparts properly assembled; furthermore, in tuting anarticle of manufacture that may be a telephone-electrode comprising twodiamade and sold separately from the telephone phragms provided eachwith a fixed carbon 2o proper, and which shall be of simple and readypoint, the two points being arranged in juxtaproduction, of highefficiency in use and operposition to and in alignment with each other,ation, and which will not'necessitate the eman annulus constructed ofsponge, arranged ployment of a high order of skill to-place it betweenthe diaphragms and surrounding in position within the telephone;furthermore, said points, an interposed body of granular 2 5 to producean electrode of the character above carbonbetween the points, and aiiexible, pe-

designated, in which the contained granular ripherally-arranged binderfor holding the carbon will be held at all times in proper relapartsproperly assembled, and, finally, in the tion to the fixed carbon pointsof the diavarious novel details of construction, as will phragms, and inwhich the holder and'diahereinafter be fully described and claimed. ophragms are hermetically sealed together in, In the accompanyingdrawings, forming a such manner as to prevent entrance of moistpart ofthis specification, and in which like ure to the electrode, and to holdthe dialetters of reference indicate corresponding phragms in fixedrelation to each other at all parts, I have illustrated one form ofemboditimes, and, at the same time, allowing such ment of my invention,capable of carrying the 8 3 5 free vibration ofthe diaphragms as topermit same into effect, although other embodiments of theaccomplishment of their proper funcmay be employed, without departingfrom the tion. spirit thereof.

With these objects in view, the invention In the drawings, Figure I is aview in transconsists in a telephone-electrode constituting versesection showing the relative positions 4o aclosed casing containingfixed carbon points, occupied by the parts constituting a telea body ofinterposed granular carbon, and an phone electrode constructed inaccordance elastic annulus surrounding the points; furwith my invention;and Fig. 2 is a view in thermore, in a telephone-electrode comprisinghorizontal section showing more particularly two diaphragms providedeach with a fixed the lcontour of the annulus and also one of 5 5 carbonpoint, the two points being arranged the carbon points, the body ofgranular carin juxtaposition to and in alignment with each bon beingomitted. other, an annulus arranged between the dia- Referring to thedrawings, A and A desigphragms and surrounding the said points, nate twometallic disks or diaphragms' to and an interposed body of granularcarbon which are suitably attached, on their inner rco 0 between thepoints; furthermore, in a telefacesthereof, carbon-points, a, anda,respectphone electrode comprising two diaphragms ively, between whichis interposed a body or mass of granular carbon. The diaphragms are tobe made of any suitable metallic substance, and of sufficient thinnessto permit of a proper degree of vibration to accomplish the function forwhich they are designed.

Interposed between the diaphragm, is an annulus B, which is constructedof sponge, or any other suitable spongiform-that is, soft, elastic, andporous or reticulated or woven substance, such as sponge-rubber, orwoven fabric in layers, that combines the properties of resiliency andnon-conductivity; but, for reasons of llghtness, and ease ofmanipulation, sponge is, in this instance, preferred. The annulus is ofa sufficient thickness to hold the carbon-points at their properdistance apart, as shown in Fig. 1, so as to permit of the granularcarbon operating to prevent any make and break of the circuit, with itsattendant disagreeable results. The diaphragms are hermetically sealedtogether by means of a peripheral binding 0, which may be of anysuitable material, such as paper or other fabric, but, in someinstances, a rubber band may be employed. Instead of making both of thediaphragms flexible, I may, in some instances, make one of them rigid,and the other resilient.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, is-

1. Atelephone electrode comprising a closed casing, a disk-like annulusfilling the space between sides of the casing, carbon buttons Within thecasing of a size to fit the opening in the annulus, and a body ofgranular carbon interposed between the said buttons, substantially asdescribed.

2. A telephone electrode comprising two diaphragms, a disk-like annulusfilling the space between the said diaphragms, carbon buttons carried bythe diaphragms of a size to fit the opening in the annulus, and a bodyof granular carbon interposed between the said buttons, substantially asdescribed.

3. A telephone electrode comprising two diaphragms, a disk-like annulusfilling the space between the said diaphragms, carbon buttons carried bythe diaphragms of a size to fit the opening in the annulus, a body ofgranular carbon interposed between the said buttons, and a peripherallyarranged binder for holding the parts assembled, substantially asdescribed.

4. A telephone electrode comprising two diaphragms, a flat spongeannulus filling the space between the said diaphragms, carbon buttonscarried by the diaphragms of a size to fit the opening in the annulus, abody of granular carbon interposed between the said buttons, and aperipherally arranged binder for holding the parts assembled,substantially as described.

5. A telephone-electrode,comprising two diaphragms provided each with afixed carbon-point, the two points being arranged in juxtaposition toand in alignment with each other, an annulus constructed of sponge,arranged between the diaphragms and surrounding said points, aninterposed body of granular carbon between the points, and a flexible,peripherally-arranged binder for holding the parts properly assembled,substantially as described.

In testimony whereof I affix my signatn re in presence of two witnesses.

DANIEL DRAWBAUGI].

Witnesses:

O. MILTON BAIR, E. II. PARRY.

